Re: Would the community be interested in these features? (Nested Transactions)

Per,

Most certainly. The Ozone and "multi-concurrent nested-
transactions" work I did has been quite useful. I'll need to 
spend a few days ensuring that I am up to date with the 
latest, as well as, getting the exact files I changed.

I can/and had plan to post a patch to sourceforge, but if 
you need it sooner I can send it your way too.

Regards,

- Tom

---- Original message ----
>Date: Sun, 25 Jul 2004 16:02:31 +0000
>From: Per Nyfelt <[email protected]>  
>Subject: Re: [Ozone-users] Would the community be 
interested in these	features?  
>To: <[email protected]>
>Cc: [email protected]
>
>Hi Tom,
>
>I think nested transactions would be a nice add-on to Ozone.
>
>Any chance you could post a patch to SourceForge patches 
section or 
>alternately send it to me privately?
>
>Best regards,
>Per
>
>
>måndag 26 april 2004 12:33 skrev [email protected]:
>> Leo,
>>
>> Thanks for the reply. My mistake on the which list to 
sent to.
>> Anyway. I agree that the last two features are not in 
keeping
>> with how ozone works and that optional flags would be most
>> fitting, assuming that folks are OK with the dirty read
>> integrity problems.
>>
>> For nested transactions, I could make it an option. Not 
much
>> code was changed. The one behavoiral change is that if a
>> thread already has a transaction associated with it, the 
next
>> tx.begin() will be nested and so on and so forth. For my
>> project nested begin(s), rollback(s), and commit(s), with
>> ozone interface architecture, fits quite nicely.
>>
>> - Tom
>>
>> ---- Original message ----
>>
>> >Date: Mon, 26 Apr 2004 11:08:25 +0200
>> >From: Leo Mekenkamp <[email protected]>
>> >Subject: Re: [Ozone-users] Would the community be 
interested
>>
>> in these features?
>>
>> >To: [email protected]
>> >Cc: [email protected]
>> >
>> >On Mon, 2004-04-26 at 02:18, [email protected] wrote:
>> >> Folks,
>> >>
>> >> Would the ozone community be interested in the 
following
>> >> features (still being tested):
>> >
>> >This thread would be more on its place on the developers
>>
>> list, but I'll
>>
>> >reply anyway ;-)
>> >
>> >All comments IMHO...
>> >
>> >>    Major feature:
>> >>     - Nested Transactions
>> >
>> >Nested external transactions would be an obvious plus, 
even
>>
>> for an
>>
>> >anti-external transaction zealot like me. Since this 
changes
>>
>> the API and
>>
>> >thus could break current working programs, this would 
have to
>>
>> be an
>>
>> >optional feature. Do you have a new constructor with a
>>
>> 'boolean nested'
>>
>> >parameter?
>> >
>> >>    Minor feature:
>> >>     - Dirty reads (changes also increase read 
performance).
>> >
>> >What exactely do you mean with dirty reads? If you mean 
that a
>> >write-locked object (lock by tx A) can be read-locked by 
another
>> >transaction (tx B), where tx B would see the 'previous
>>
>> incarnation' or
>>
>> >'rolled-back version' of that object, then I would have 
to
>>
>> object (pun
>>
>> >intended), since this leads to data integrity problems 
and
>>
>> hard to trace
>>
>> >logic errors.
>> >
>> >>    Whatever feature:
>> >>     - Explicit transactions throw an exception 
indicating that
>> >>       the transaction would block.
>> >>       Implicit transactions still block (in keeping 
with the
>> >>       current behavior).
>> >
>> >Could be helpful in some exotic situations. Again, this 
would
>>
>> have to be
>>
>> >optional, since it changes the API. A 'boolean
>>
>> throwExceptionOnBlock'
>>
>> >parameter on a new constructor?
>> >
>> >Cheers,
>> >Leo
>> >
>> >
>> >
>> >
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